Conserved and nonconserved structures in the secretory proteins encoded in the Balbiani ring genes ofChironomus tentans

1984 ◽  
Vol 20 (3-4) ◽  
pp. 304-312 ◽  
Author(s):  
L. Wieslander ◽  
C. Höög ◽  
J. -O. Höög ◽  
H. Jörnvall ◽  
U. Lendahl ◽  
...  
Keyword(s):  
Secretory Proteins ◽  
Balbiani Ring ◽  
Balbiani Ring Genes

Balbiani ring genes and their induction

1984 ◽  
pp. 153-160 ◽  
Author(s):  
R. Galler ◽  
N. Riedel ◽  
L. Rydlander ◽  
J.-E. Edström
Keyword(s):  
Balbiani Ring ◽  
Balbiani Ring Genes

Secretory proteins and Balbiani ring gene activities in salivary glands of Chironomus thummi larvae

Chromosoma ◽  
1983 ◽  
Vol 88 (1) ◽  
pp. 16-23 ◽  
Author(s):  
E. Serfling ◽  
L. Meyer ◽  
A. Rudolph ◽  
Kerstin Steiner
Keyword(s):  
Salivary Glands ◽  
Secretory Proteins ◽  
Balbiani Ring ◽  
Chironomus Thummi

scholarly journals Rapid and Concerted Evolution of Repeat Units in a Balbiani Ring Gene

Genetics ◽  
1987 ◽  
Vol 117 (1) ◽  
pp. 43-49
Author(s):  
U Lendahl ◽  
H Saiga ◽  
C Höög ◽  
J E Edström ◽  
L Wieslander
Keyword(s):  
Repeat Unit ◽  
Secretory Proteins ◽  
Chironomus Tentans ◽  
Balbiani Ring ◽  
Nucleotide Level ◽  
Related Sequence ◽  
The Core ◽  
Repeat Units ◽  
High Degree ◽  
Evolutionary Fate

ABSTRACT The Balbiani ring (BR) genes in the midge Chironomus, a genus belonging to Diptera, code for large secretory proteins, used to construct the larval tube. The 15-23-kb long core block in each gene consists of an array of tandemly arranged approximately 200-bp long repeat units, where a single repeat unit is composed of a constant and a subrepeat region. In order to investigate the evolutionary fate of highly repetitive coding DNA, the BR1γ core block in Chironomus pallidivittatus was characterized and compared to the orthologous core block in the sibling species Chironomus tentans. We find that the 75-100 repeat units in the BR1γ core block have evolved in an unusual fashion. In all repeat units the constant regions display an expected high degree of homology between the two species, 94% at the nucleotide level. In contrast, the subrepeat regions in all repeat units have diverged concertedly, both as to length, number and sequence of the subrepeats. The observed changes in all repeat units of the core block probably have occurred after speciation of C. pallidivittatus and C. tentans. These findings demonstrate that a tandemly reiterated coding sequence can rapidly and concertedly convert into a related sequence, much in the same way as has been described for satellite DNA.

The 3-D substructure of RNA in nascent RNP granules: A novel application of osmium ammine-B staining and electron spectroscopic imaging

1992 ◽  
Vol 50 (1) ◽  
pp. 504-505
Author(s):  
Ada L. Olins ◽  
Donald E. Olins ◽  
Manesh B. Shah ◽  
Henri A. Levy ◽  
David P. Bazett-Jonest
Keyword(s):  
Salivary Gland ◽  
Polytene Chromosomes ◽  
Spectroscopic Imaging ◽  
Secretory Proteins ◽  
Chironomus Tentans ◽  
Balbiani Ring ◽  
Electron Spectroscopic Imaging ◽  
Nuclear Pores ◽  
Rnp Granules

RNA has a particulate substructure when visualized in situ with the nucleic acid specific stain osmium ammine-B (OA-B). In this study energy spectroscopic imaging (ESI) was used to enhance the contrast and collect the data for tomographic reconstructions.The Balbiani ring (BR) in the salivary gland polytene chromosomes of Chironomus tentans larvae furnishes a well known model for the structure of nascent m-RNA. This gland produces copious amounts of silk-like secretory proteins which are very large (106 daltons). The site of transcription, the BR, is easily recognized in the EM by its characteristic “puff” structure and electron-dense granular transcripts. Mature BR granules are 45-50 nm in diameter and can be easily observed within the nucleus and passing through nuclear pores.

Activation of Balbiani ring genes inChironomus tentans after a pilocarpine-induced depletion of the secretory products from the salivary gland lumen

1980 ◽  
Vol 80 (2) ◽  
pp. 409-418 ◽  
Author(s):  
R. Ma¨hr ◽  
B. Meyer ◽  
B. Daneholt ◽  
H.M. Eppenberger
Keyword(s):  
Salivary Gland ◽  
Balbiani Ring ◽  
Balbiani Ring Genes ◽  
Secretory Products

Rapid reformation of the thick chromosome fiber upon completion of RNA synthesis at the Balbiani ring genes in Chironomus tentans

Chromosoma ◽  
1982 ◽  
Vol 87 (1) ◽  
pp. 33-48 ◽  
Author(s):  
K. Andersson ◽  
R. M�hr ◽  
B. Bj�rkroth ◽  
B. Daneholt
Keyword(s):  
Rna Synthesis ◽  
Chironomus Tentans ◽  
Balbiani Ring ◽  
Balbiani Ring Genes

Terminal repeats in long repeat arrays are likely to reflect the early evolution of Balbiani ring genes

1988 ◽  
Vol 200 (4) ◽  
pp. 655-664 ◽  
Author(s):  
Christer Höög ◽  
Bertil Daneholt ◽  
Lars Wieslander
Keyword(s):  
Early Evolution ◽  
Balbiani Ring ◽  
Balbiani Ring Genes ◽  
Terminal Repeats

Identification of the spI products of Balbiani ring genes in Chironomus thummi

Chromosoma ◽  
1989 ◽  
Vol 98 (6) ◽  
pp. 428-432 ◽  
Author(s):  
E. Cort�s ◽  
L. M. Botella ◽  
D. Barettino ◽  
J. L. D�ez
Keyword(s):  
Balbiani Ring ◽  
Balbiani Ring Genes ◽  
Chironomus Thummi
Sign in / Sign up

Export Citation Format

Share Document